Page 11 - Railways

www.moniterra.engineering RAILWAYS

The way to deal with this problem was to take the necessary Often, that was not an adequate solution and it was necessary
protection measures and the increased attention by our crews. to wait for certain works to end in order to start measurements
again.
b) As regards the phase of track adjustment-tracing, due to
the very high requirements, the weather conditions during the 6.) EQUIPMENT USED:
summer were an inhibitory factor for measurement accuracy. • GRP 1000 AMBERG track geometry control system
This was dealt with by providing the best possible protection
to the instruments from solar radiation and high temperatures, • GRP 5000 AMBERG clearance control system
and with very frequent and close set ups of the geodetic station • Geodetic Stations LEICA 1201, 1’’,+/- (2mm+2ppm) ,
in relation to the GRP, thus minimizing possible errors. LEICA 2003, 0,5’’, +/- (1mm+1ppm) , and Trimble S6 High
c) The narrowness of the space at the project limited the Precision, 1’’, +/- (1mm+1ppm).
flexibility of movement both outside, but especially inside the • Digital Level TRIMBLE Dini (0.3mm/km)
“Monastiraki – Attiki” tunnel. As a result:
• Laser Scanner 5003 AMBERG
- The reference targets and controls were destroyed by
passing cars and machinery, and therefore needed to be • 4 dual frequency TRIMBLE R8 and 7 single frequency
reinstalled and included again in the system. TRIMBLE R3 GPS.
- The restriction of visibilities during the orientation of the
geodetic station and the monitoring due to the existing
machinery, tools or workers.
The only way to deal with this problem was through correct
scheduling and coordination of the works in the right sequence.

The Principle:

ACCURATE RAIL TRACK GEOMETRY

TAMPING LASER SCANNING
SLAB TRACK GRP 5000

BALLASTED TRACK
GRP 1000

IMS 1000 Structure Envelope Tunnel
IMS 3000 PROFILES CLEARANCE INSPECTION

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